IBM ThinkCentre 8127, Hardware Maintenance Manual

Page: 17 / 196

Chapter 3. General Checkout
This general checkout procedure is for Type 8127, 8183, 8184, 8320, 8416, 8417,
8418, 8419, and 8429 computers.
Attention
The drives in the computer you are servicing might have been rearranged or
the drive startup sequence changed. Be extremely careful during write
operations such as copying, saving or formatting. Data or programs can be
overwritten if you select an incorrect drive.
Diagnostic error messages appear when a test program finds a problem with a
hardware option. For the test programs to properly determine if a test Passed , Failed
or Aborted , the test programs check the error-return code at test completion. See
“Diagnostic error codes” on page 49.
General error messages appear if a problem or conflict is found by an application
program, the operating system, or both. For an explanation of these messages, refer
to the information supplied with that software package.
Notes:
v
The default for this computer is to boot up quiet (no beep and no memory count and
checkpoint code display) when no errors are detected by POST.
v
To enable beep and memory count and checkpoint code display when a successful POST
occurs, do the following:
1. Select Start Options in the IBM Setup Utility program (see “Starting the IBM Setup
Utility program” on page 19).
2. Set Power-On Self-Test to Enhanced .
v
Before replacing any FRUs, ensure that the latest level of BIOS is installed on the system.
A down-level BIOS might cause false errors and unnecessary replacement of the system
board. For more information on how to determine and obtain the latest level BIOS, see
“BIOS levels” on page 147.
v
If multiple error codes are displayed, diagnose the first error code displayed.
v
If the computer hangs with a POST error, go to Chapter 7, “Symptom-to-FRU Index,” on
page 47.
v
If the computer hangs and no error is displayed, go to “Undetermined problems” on
page 89.
v
If an installed device is not recognized by the diagnostics program, that device might be
defective.
001
1. Power-off the computer and all external devices.
2. Check all cables and power cords.
3. Make sure the system board is seated properly.
4. Set all display controls to the middle position.
5. Power-on all external devices.
6. Power-on the computer.
7.
Check for the following response:
© Copyright IBM Corp. 2005
11